Process of dyeing



Patented Mar. 2 2 I927.

, UNITED STATES PATEN OFFICE.

PAUL BABE, OF LEVERKUSEN, NEAR COLOGNE-ON-THE-RHINE,'GERMANY, ASSIGNOB,BY MESNE ASSIGNMENTS, '.I.O GBASSELLI DYESTUIF CORPORATION, OF NEW YORK,

N. Y., A CORPORATION OF DELAWARE.

PROCESS OF DYEING.

No Drawing. Application filed April 11, 1924, Serial 705,938, and inGermany May 8, 1923. i

United States Patent No. 1,517,581 describes the dyeing of acidylcellulose material with the addition of pyridines in the dyeing.

It has now been found that hydrogenated pyliidines e. g. piperidine canalso be used. But the preferred embodiment of my 1nvention is in the useof heterocyclic, particularly the hydrogenated pyridine, bases.

' In order to illustrate the new process more fully, the followingexample is given Ewample.To a solution of 0.1 gram. of diamantfuchsinein 100 cubic centimeters of water 1 gram piperidine is added and thesolution is heated to 60 C. The dyeing is carried out at' thistemperature and is con tinuedfor from hour, after which the goods arerinsed and acidified in the cold.

Other dyes can be used 8. g. rhoduline orange NO, crystal violet P,chrysoidine G extra, rhoduline heliothrop B, etc., or other of the abovementioned additions, to the dye bath may be employed, such asdipiperidyl, ortho-toluidine m-Il'lGthflIl-SlllfOlllC acid,

guanidine, etc.

I claim 1. Process for dyeing acidyl celluloses or their transformationproducts, characterized in and by the fact that a hydrogenated pyridinecompound'is added in the dyeing, substantiall as described.

2. A yeing composition comprising a dye and a hydrogenated pyridinecompound, substantially as described.

3. An acidyl cellulose fabric treated with a dye and a hydrogenatedpyridine compound, substantially as described. I

In testimony whereof I have hereunto set my hand.

PAUL BABE.

